After a 40 hour break-in I've come to the following conclusions: Mullard GZ34 rectifier; Tesla (60's vintage) el84's and RCA 5751 as the driver. The sound is outstanding! I hope everyone has the same pleasure from their set-up.

Since starting this thread, one of my Tesla's died, and I switched to nos Russian military el84-M. They are as good or better. The reviews of this tube are as I have found: balanced, tight bass, excellent mid and extended. They are "military grade" because of the heavy glass; at least twice as much weight as a standard el84. I've also switched to an Amperex bugle boy AT7. All great!

I have a pair of military sv83's after your kind suggestion and reference. Right out of the box they sound very good. After some hours, my guess is that they will be the equal or better than the Russian military el84. Thanks.

They will sound much better as they break in. But difference will be in that they will be more laid back than the EL 84. I am glad you like them. Here is what Steve says in his design note for Taboo

In the Taboo, the SV83's used in our Triode amps sound very good. Glass smooth with great micro detail. A good pair of EL84's have more spank and presence. The difference between the two is fairly large while on the Triode amps the difference is only nominal.